197320978 has 4 divisors (see below), whose sum is σ = 295981470. Its totient is φ = 98660488.

The previous prime is 197320931. The next prime is 197320997. The reversal of 197320978 is 879023791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 879023791 = 331 ⋅2655661.

It can be written as a sum of positive squares in only one way, i.e., 109767529 + 87553449 = 10477^2 + 9357^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49330243 + ... + 49330246.

Almost surely, 2^197320978 is an apocalyptic number.

197320978 is a deficient number, since it is larger than the sum of its proper divisors (98660492).

197320978 is an equidigital number, since it uses as much as digits as its factorization.

197320978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98660491.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 197320978 is about 14047.0985616247. The cubic root of 197320978 is about 582.1806318476.

The spelling of 197320978 in words is "one hundred ninety-seven million, three hundred twenty thousand, nine hundred seventy-eight".